Had pencilled in rain in the early morning (5)

I believe the answer is:

drawn

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'had pencilled' is the definition.
I can't judge whether this defines the answer.

'rain in the early morning' is the wordplay.
'rain' becomes 'r' (this might be a standard abbreviation I've not previously seen).
'in the' is an insertion indicator.
'early morning' becomes 'dawn' (I've seen this before).
'r' placed inside 'dawn' is 'DRAWN'.

'in' is the link.

Can you help me to learn more?

(Other definitions for drawn that I've seen before include "Picked" , "Looking strained, sketched" , "stressed" , "Sketched or tied" , "27 [ON TOW]," .)

I've seen this clue in the Evening Standard.

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